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IUS materials outgassing condensation effects on sensitive spacecraft surfacesFour materials used on the inertial upper state (IUS) were subjected to vacuum conditions and heated to near-operational temperatures (93 to 316 C), releasing volatile materials. A fraction of the volatile materials were collected on 25 C solar cells, optical solar reflectors (OSR's) or aluminized Mylar. The contaminated surfaces were exposed to 26 equivalent sun hours of simulated solar ultraviolet (UV) radiation. Measurements of contamination deposit mass, structure, reflectance and effects on solar cell power output were made before and after UV irradiation. Standard total mass loss - volatile condensible materials (TML - VCM) tests were also performed. A 2500 A thick contaminant layer produced by EPDM rubber motor-case insulation outgassing increased the solar absorptance of the OSR's from 0.07 to 0.14, and to 0.18 after UV exposure. An 83,000 A layer caused an increase from 0.07 to 0.21, and then the 0.46 after UV exposure. The Kevlar-epoxy motor-case material outgassing condensation raised the absorptance from 0.07 to 0.13, but UV had no effect. Outgassing from multilayer insulation and carbon-carbon nozzle materials did not affect the solar absorptance of the OSR's.
Document ID
19820017435
Document Type
Conference Paper
Authors
Mullen, C. R. (Boeing Aerospace Co. Seattle, WA, United States)
Shaw, C. G. (Boeing Aerospace Co. Seattle, WA, United States)
Crutcher, E. R. (Boeing Aerospace Co. Seattle, WA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Publication Information
Publication: NASA. Goddard Space Flight Center 12th Space Simulation Conf.
Subject Category
SPACECRAFT DESIGN, TESTING AND PERFORMANCE
Funding Number(s)
CONTRACT_GRANT: F04701-78-C-0053
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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